"Wayne" napisal w wiadomosci
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"Szczepan Bialek" wrote in message
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On Friday, April 26, 2013 12:38:06 PM UTC-5, Irv Finkleman wrote:
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Maybe SB can explain the difference between a monopole with a single
ungrounded radial, and a dipole.

Each radial, grounded or not (but connected to the shield of the coax),
is the ground.
The Earth, the Moon, a satelite and each piece of conductor is ground for
antennas. Radial is one of them.
Ground must be adequate to kW.

What if the single ungrounded quarter wave radial is in line with the
quarter wave radiator?
Is it still a monopole?

# Of course.

Wow...you gave a lot to digest.

Just to understand the discussion, let's address the monopole with one
radial.

Assuming the monopole is 1/4 wave long, and has a 1/4 wave long radial.
The radial is in line with the monopole. Everything is ungrounded.

The radial connected with the shield of the coax is the ground.

How does that configuration of a monopole with one radial differ from a
dipole?

The first dipole was the Hertz dipole. The both legs were fed with the same
frequency but not in phase. The both ends radiate with the same intensity.
The Marconi antenna has only one radiated leg. It is almost in the free
space (masts are high).

The horizontal dipole radiate in one horizontal direction only. The vertical
in all horizontal directions. But the mast must be very high.
The horizontal, vertical or tilted monopole radiate in all directions. Your
cell phone has the monopole.
S*